| Latest matches Ruben Hartig: | ||
| Date | Home - Away | Score |
| 17.08.25 | Tennis. Men. ITF 15. Huy. Belgium. Clay. Qualifying (3rd set in super tie-break format). | |
| Ruben Hartig - Mao Poels | 1:2 (6:4, 5:7, 6:10) | |
| 08.07.25 | Tennis. Men. ITF 25. Kassel. Germany. Clay. Qualifying (3rd set in super tie-break format). | |
| Iannis Miletich - Ruben Hartig | 2:0 (6:3, 6:1) | |
| 23.06.25 | Tennis. Men. ITF 15. Casablanca. Morocco. Clay. Qualification (3rd set in super tie-break format). | |
| Ilyas Fahim - Ruben Hartig | 2:0 (6:2, 6:4) | |
| 22.06.25 | Tennis. Men. ITF 15. Casablanca. Morocco. Clay. Qualification (3rd set in super tie-break format). | |
| Ruben Hartig - Mousa Zayed | 2:0 (6:4, 7:5) | |
| 09.06.25 | Tennis. Men. ITF 25. Varnamo. Sweden. Clay. Qualifying (3rd set in super tie-break format). | |
| Jan Simonsson - Ruben Hartig | 2:1 (6:3, 4:6, 10:7) | |
| Latest matches Mao Poels: | ||
| Date | Home - Away | Score |
| 17.08.25 | Tennis. Men. ITF 15. Huy. Belgium. Clay. Qualifying (3rd set in super tie-break format). | |
| Ruben Hartig - Mao Poels | 1:2 (6:4, 5:7, 6:10) | |
| 10.08.25 | Tennis. Men. ITF 25. Koksijde. Belgium. Clay. Qualifying (3rd set in super tie-break format). | |
| Ferdinand Novkirichka - Mao Poels | 2:0 (6:1, 6:3) | |
| 28.07.25 | Tennis. Men. ITF 25. Wetzlar. Germany. Clay. Qualifying (3rd set in super tie-break format). | |
| Mao Poels - Yannic Nittmann | 0:2 (3:6, 3:6) | |
| 22.06.25 | Tennis. Men. ITF 25. Brussels. Belgium. Clay. Qualifying (3rd set in super tie-break format). | |
| David Tixhon - Mao Poels | 2:0 (6:3, 7:6) | |
| 13.01.25 | Tennis. Men. ITF 15. Bressuire. France. Indoor Hard. Qualifying (3rd set in super tie-break format). | |
| Mao Poels - Markus Molder | 0:2 (1:6, 2:6) | |
| HEAD-TO-HEAD: | ||
| Date | Home - Away | Score |
| 17.08.25 | Ruben Hartig - Mao Poels | 1:2 (6:4, 5:7, 6:10) |